CN211859698U

CN211859698U - 48V power supply system applied to recreational vehicle with photovoltaic power generation

Info

Publication number: CN211859698U
Application number: CN202020599376.XU
Authority: CN
Inventors: 杨晓川; 高凡刚
Original assignee: Nanjing Nature Power Co ltd
Current assignee: Nanjing Nature Power Co ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-11-03
Anticipated expiration: 2030-04-20

Abstract

The utility model provides a 48V power supply system applied to a motor home with photovoltaic power generation, which comprises a generator, a 12V starting battery, a bidirectional DCDC module, a lithium battery, a control module, a charging and inverting integrated machine, a photovoltaic charging controller, an intelligent household module and a photovoltaic cell panel; the positive and negative electrodes of the output end of the generator are respectively connected to the positive and negative electrodes of a 12V starting battery through cables; the positive electrode and the negative electrode of the 12V starting battery are respectively connected to the 12V positive electrode and the 12V negative electrode of the bidirectional DCDC module through cables; the positive electrode and the negative electrode of the 48V side of the bidirectional DCDC module are respectively connected to the positive electrode and the negative electrode of the lithium battery; the positive electrode and the negative electrode of the lithium battery are respectively connected with the charging and inverting integrated machine and the positive electrode and the negative electrode of the 48V side of the photovoltaic charging controller; the positive electrode and the negative electrode of the photovoltaic cell panel are respectively connected to the input port of the photovoltaic charge controller; the utility model discloses can greatly reduced line current, effectively avoid the spontaneous combustion phenomenon because of the heavy current generates heat and causes.

Description

48V power supply system applied to recreational vehicle with photovoltaic power generation

Technical Field

The utility model relates to a electrical power generating system technical field, in particular to be applied to 48V electrical power generating system who takes photovoltaic power generation car as a house.

Background

The early-stage motor home power supply is a 12V system, a generator generates power and charges a starting storage battery, the 12V energy storage battery of the motor home is connected in parallel to the starting battery through an isolator, the isolator is attracted when the voltage of the starting storage battery is greater than 14V, and the 12V energy storage battery of the motor home enters a charging state; at this time, the maximum charging current can reach 150A, which puts high demands on the charging circuit system of the whole vehicle. All cable joints are subjected to special treatment, and all switches, fuses and contactors on a circuit have to use the specification of high current, which undoubtedly increases the complexity of the circuit and the installation and maintenance costs; the 12V dual battery isolator fuse specification is 500A and also often damages the fuse.

The problem during discharging is more outstanding, and when the car as a house of traditional 12V energy storage battery system was in the power consumption process, air conditioner and thermos were used simultaneously, and the continuous current of the 12V circuit up to 280A, this current value had surpassed the limit condition of indoor wiring. The cable and the connector generate heat due to large current, and even the safety of electricity utilization can be influenced under severe conditions, so that the problem of fire of a motor home circuit is caused. And the circuit loss can be greatly reduced by increasing the voltage of 12V to 48V, and the circuit current can be greatly reduced by the voltage of 48V, thereby effectively avoiding the spontaneous combustion phenomenon caused by the heating of large current and avoiding the problems caused by various super-large currents.

SUMMERY OF THE UTILITY MODEL

The purpose of the present invention is to solve at least one of the technical drawbacks.

Therefore, the utility model aims to provide a be applied to 48V electrical power generating system who takes photovoltaic power generation car as a house, can greatly reduced line current, effectively avoid the spontaneous combustion phenomenon because of the heavy current generates heat and causes.

In order to achieve the purpose, the embodiment of the utility model provides a 48V power supply system applied to a motor home with photovoltaic power generation, which comprises a power generator, a 12V starting battery, a bidirectional DCDC module, a lithium battery, a control module, a charging and inverting integrated machine, a photovoltaic charging controller, an intelligent home module and a photovoltaic cell panel;

the positive and negative electrodes of the output end of the generator are respectively connected to the positive and negative electrodes of a 12V starting battery through cables; the positive electrode and the negative electrode of the 12V starting battery are respectively connected to the 12V positive electrode and the 12V negative electrode of the bidirectional DCDC module through cables; the positive electrode and the negative electrode of the 48V side of the bidirectional DCDC module are respectively connected to the positive electrode and the negative electrode of the lithium battery; the positive electrode and the negative electrode of the lithium battery are respectively connected with the charging and inverting integrated machine and the positive electrode and the negative electrode of the 48V side of the photovoltaic charging controller; the positive electrode and the negative electrode of the photovoltaic cell panel are respectively connected to the input port of the photovoltaic charge controller;

the output end of the 12V starting battery is further connected with the power supply end of the control module, the output end of the control module is connected with the power supply end of the lithium battery and the power supply end of the household control module respectively, and the starting signal of the generator is further connected with the input end of the control module.

In any of the above schemes, preferably, the bidirectional DCDC module includes a 12V to 48V boost charging module, a 48V to 12V buck charging module, an MCU module, and a CAN level conversion module; the 12V-to-48V boosting charging module and the 48V-to-12V reducing charging module are respectively connected with the MCU module, and the MCU module is connected with the CAN level conversion module.

In any of the above schemes, preferably, the 48V to 12V buck charging module includes a first surge suppression circuit, an electromagnetic filter circuit, a buck H-bridge, a first transformer, a buck rectifying/filtering circuit, and a second surge suppression circuit; the input end of the first surge suppression circuit is connected with 48V voltage, the output end of the first surge suppression circuit is connected with an electromagnetic filter circuit, the output end of the electromagnetic filter circuit is connected with the input end of a voltage reduction H bridge, the output end of the voltage reduction H bridge is connected with a first transformer, the output end of the first transformer is connected with a voltage reduction rectifying/filtering circuit, the output end of the voltage reduction rectifying/filtering circuit is connected with a second surge suppression circuit, and the output end of the second surge suppression circuit outputs 12V voltage.

Preferably, in any of the above schemes, the 48V-to-12V step-down charging module further includes a first driving circuit, a step-down voltage sampling circuit, a step-down current sampling circuit, a step-down detection circuit, a step-down MCU, a step-down side optocoupler isolator, and a step-down DSP, an output end of the electromagnetic filter circuit is further connected to an input end of the step-down detection circuit, an output end of the step-down detection circuit is connected to the step-down MCU, an output end of the step-down MCU is connected to the step-down side optocoupler isolator, an output end of the step-down side optocoupler isolator is connected to the step-down DSP, the step-down DSP is connected to the main MCU through a first stage optocoupler isolator, input ends of the step-down voltage sampling circuit and the step-down current sampling circuit are respectively connected to an output end of the step. The voltage reduction DSP is also connected with the input end of the first driving circuit, and the output end of the first driving circuit is connected with the voltage reduction H bridge.

In any of the above schemes, preferably, the 48V to 12V step-down charging module further includes a step-down auxiliary power supply and a third transformer, the electromagnetic filter circuit is further connected to an input end of the step-down auxiliary power supply, an output end of the step-down auxiliary power supply is connected to the third transformer, and the third transformer outputs the auxiliary power supply.

In any of the above schemes, preferably, the 12V to 48V boost charging module includes a boost second rectifying/smoothing circuit, a third surge suppression circuit, a boost first rectifying/smoothing circuit, a fifth transformer, a boost H bridge, and a fourth surge suppression circuit; the input end of the fourth surge suppression circuit is connected with 12V voltage, the output end of the fourth surge suppression circuit is connected with a boost H bridge, the output end of the boost H bridge is connected with a fifth transformer, the output end of the fifth transformer is connected with a boost first rectifying/filtering circuit, the output end of the boost first rectifying/filtering circuit is connected with a third surge suppression circuit, the output end of the third surge suppression circuit is connected with a boost second rectifying/filtering circuit, and the output end of the boost second rectifying/filtering circuit outputs 48V voltage.

In any of the above schemes, preferably, the 12V to 48V boost charging module further includes a boost detection circuit, a boost MCU, a boost side optical coupling isolation, a boost DSP, a boost voltage sampling circuit, a boost current sampling circuit, and a second driving circuit; the output end of the fourth surge suppression circuit is connected with the boost detection circuit, the output end of the boost detection circuit is connected with the boost MCU, the output end of the boost MCU is connected with the boost side optical coupling isolation, the output end of the boost side optical coupling isolation is connected with the boost DSP, the input ends of the boost voltage sampling circuit and the boost current sampling circuit are connected with the output end of the boost first rectifying/filtering circuit, the output ends of the boost voltage sampling circuit and the boost current sampling circuit are connected with the boost DSP, the output end of the boost DSP is connected with the second drive circuit, the output end of the second drive circuit is connected with the boost H bridge, and the boost DSP is further connected with the main MCU through the second stage optical coupling isolation.

In any of the foregoing schemes, preferably, the 12V to 48V boost charging module further includes a boost auxiliary power supply and a sixth transformer, an output terminal of the boost second rectifying/filtering circuit is connected to an input terminal of the boost auxiliary power supply, an output terminal of the boost auxiliary power supply is connected to an input terminal of the sixth transformer, and an output terminal of the sixth transformer outputs the auxiliary power supply.

In any of the above schemes, preferably, the smart home module is at least connected to an inversion function switch of the inversion all-in-one machine, an entertainment system switch, a lighting system switch, a water tank switch, an air conditioner switch and a heater switch.

In any of the above schemes, preferably, the control module, the bidirectional DCDC module, the charging and inverting all-in-one machine, the photovoltaic charging controller, the lithium battery, and the CAN communication interface of the smart home module are respectively connected to a CAN bus of the power supply system.

The utility model discloses a be applied to 48V electrical power generating system who takes photovoltaic power generation car as a house has following beneficial effect:

1. the utility model discloses a convert traditional 12V energy storage battery system into 48V and give the car as a house power supply, greatly reduced line current effectively avoids the spontaneous combustion phenomenon because of the heavy current generates heat and causes, avoids the problem that various super large currents brought simultaneously.

2. The utility model discloses a two-way DCDC module can transmit the generator energy for 48V lithium cell, can also transmit 48V lithium cell energy for the 12V side, makes the utility model discloses can match with current 12V car as a house. Therefore, when the vehicle is parked, the energy of the 48V lithium battery is transferred to the 12V side to provide electric energy for 12V loads of the original vehicle.

3. The utility model discloses a two-way DCDC module, fill the contravariant all-in-one, photovoltaic charge controller, photovoltaic cell board etc. combined design, can realize no matter driving or when parking, all can provide the power for the car as a house, adopt to fill the contravariant all-in-one and turn into 220V with 48V and give 220V's electrical apparatus power supply in the car as a house, when not having the commercial power, photovoltaic cell board turns into solar energy electric energy for lithium cell power supply to provide the electric energy for the car as a house.

4. The utility model discloses a two-way DCDC module B has still set for dynamic adjustment charging current and has been the power for make full use of generator, avoids simultaneously under the great condition of former car 12V load, and the energy of 12V start-up battery can be used for stepping up and charge, avoids the problem that can't start the car once more after stopping that arouses from this.

5. The utility model discloses utilize CAN communication interface to connect each module, control module, two-way DCDC module promptly, fill on contravariant all-in-one, photovoltaic charge controller, lithium cell, intelligent house module's CAN communication interface receives electrical power generating system's CAN bus respectively for each module CAN be managed in unison to control module, and pass to house control module's display panel to operating condition information.

6. The utility model adopts a modularized structure, and divides the whole circuit structure into a plurality of small independent and interactive modules; on one hand, the product development and manufacturing period can be shortened, the product series is increased, the product quality is improved, and the market change can be quickly coped with; on the other hand, the adverse effect on the environment can be reduced or eliminated, and the reuse, the upgrade, the maintenance and the disassembly, the recovery and the treatment after the product abandonment are convenient.

7. The utility model has the advantages that the components are universal, the circuit principle is simple, the overall manufacturing cost is greatly reduced, and the integration is convenient; the boosting device is high in boosting efficiency, good in user experience effect and capable of being popularized and used on a large scale.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block diagram of the present invention;

fig. 2 is a structural diagram of a bidirectional DCDC module according to the present invention;

fig. 3 is a circuit structure diagram of the bidirectional DCDC module of the present invention;

fig. 4 is a flow chart of the present invention.

In the figure, A, a control module; B. a bidirectional DCDC module; C. charging and inverting integrated machines; D. a photovoltaic charge controller; E. a lithium battery; F. an intelligent home module; G. a generator; H. starting the battery at 12V; I. a photovoltaic cell panel;

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The utility model provides a be applied to 48V electrical power generating system who takes photovoltaic power generation car as a house, as shown in fig. 1-4, start battery H, two-way DCDC module B, lithium cell E, control module A, fill contravariant all-in-one C, photovoltaic charge controller D, intelligent house module F, photovoltaic cell board I including generator G, 12V. CAN communication interfaces of the control module A, the bidirectional DCDC module B, the charging and inverting integrated machine C, the photovoltaic charging controller D, the lithium battery E and the intelligent home module F are respectively connected to a CAN bus of the power supply system. The control module A identifies the working state of each device through the CAN bus and sends an instruction according to the relevant state.

The positive and negative electrodes of the output end of the generator G are respectively connected to the positive and negative electrodes of the 12V starting battery H through cables; the positive electrode and the negative electrode of the 12V starting battery H are respectively connected to the 12V positive electrode and the 12V negative electrode of the bidirectional DCDC module B through cables; the positive electrode and the negative electrode of the 48V side of the bidirectional DCDC module B are respectively connected to the positive electrode and the negative electrode of the lithium battery E; the positive electrode and the negative electrode of the lithium battery E are respectively connected with the positive electrode and the negative electrode of the charging and inverting integrated machine C and the positive electrode and the negative electrode of the 48V side of the photovoltaic charging controller D; the positive pole and the negative pole of the photovoltaic cell panel I are respectively connected to the input ports of the photovoltaic charge controller D. The output end of the 12V starting battery H is further connected with the power supply end of the control module A, the output end of the control module A is connected with the power supply end of the lithium battery E and the power supply end of the household control module A respectively, and the starting signal of the generator is further connected with the input end of the control module A.

The working principle is as follows: during driving, electric energy generated by the generator G is output to a 12V starting battery H, the 12V starting battery H is output to a bidirectional DCDC module B, the bidirectional DCDC module B converts 12V voltage into 48V voltage and outputs the 48V voltage to a lithium battery E for storage, and the driving charging function is completed; when parking, the lithium battery E outputs electric energy to the bidirectional DCDC module B, the bidirectional DCDC module B converts the 48V voltage into the 12V voltage to provide electric energy for 12V loads of the original vehicle, and in addition, the lithium battery E can also convert the 48V into 220Vac single-phase alternating current through the charging and inverting integrated machine C to be supplied to 220V household appliances of the motor home for use no matter driving or parking; the generator G transmits a generator starting signal to the control module, the bidirectional DCDC module B, the lithium battery E, the charging and inverting integrated machine C and the photovoltaic charging controller D transmit state information to the CAN bus through CAN communication, the state information is uniformly allocated by the control module, and the working state information is transmitted to a control panel of the household control module.

Wherein, fill contravariant all-in-one C and both can charge for lithium cell E through the commercial power under the parking state, also can not insert the condition with lithium cell E's electric energy you become 220Vac single-phase alternating current under the commercial power, supply with the domestic appliance use of car as a house. The charging and inverting integrated machine C communicates with the control module A through CAN communication, uploads a working state to a CAN bus, and receives a CAN bus instruction from the control module A. Aiming at the problems of the existing 12V energy storage battery, the boosting charging of the charging and inverting integrated machine C is constant current charging, and the charging current of the charging and inverting integrated machine C follows the charging instruction of the lithium battery module E.

The lithium battery E adopts an energy management strategy, which specifically comprises the following steps: 1) the electric quantity of the lithium battery is lower than 90%, the control module starts charging according to the running state of the equipment, the priority is that the charging and inversion integrated machine is larger than the bidirectional DCDC module, and the photovoltaic charging priority is lowest. 2) The lithium battery is started to alarm when the electric quantity is lower than 10%, a high-power electric appliance (an inversion mode of a 48V air conditioner and a charging and inverting integrated machine) is turned off, and a control module sends a charging request instruction to a home control module to prompt a vehicle owner to charge. 3) The electric quantity is lower than 5%, most electric equipment is turned off, the bidirectional DCDC voltage reduction state is turned to standby, and only the illuminating lamp is reserved. 4) The electric quantity is lower than 3%, and the control module sends an instruction to cut off all loads and waits for charging. The electric quantity information is sent to the control panel by the control module and prompts an alarm to a client.

And the photovoltaic charging controller D adjusts the charging voltage and the charging current according to the state of the photovoltaic cell panel after receiving the charging instruction from the control module. And the photovoltaic charging controller D is communicated with the control module A through a CAN bus. Aiming at the problems of the existing 12V energy storage battery, the boosting charging of the photovoltaic charging controller D is constant current charging, and the charging current of the photovoltaic charging controller D follows the charging instruction of the lithium battery module E.

The drivers and passengers can observe the working states of all the devices through the home control module F, and the home control module F can record the relevant states and is convenient for the maintainers to process and maintain in the background. The household control module F is at least connected with an inversion function switch of the charging and inversion all-in-one machine, an entertainment system switch, a lighting system switch, a water tank switch, an air conditioner switch, a heater switch and the like. The home control module communicates with the control module A through the CAN bus, and receives and sends instructions to the control module A.

The bidirectional DCDC module is a key component for realizing a 48V power supply system of a motor home, can transmit the energy of a generator during driving to a 48V lithium battery E to complete the function of charging during driving based on the bidirectional DCDC module, can also transmit the energy of the 48V lithium battery E to a 12V side, and provides electric energy for a 12V load of an original vehicle during parking.

The bidirectional DCDC module B integrates two power supply modules: a 12V-to-48V boosting charging module J and a 48V-to-12V step-down charging module K; the MCU module L in the bidirectional DCDC module B is respectively communicated with the 12V-to-48V boosting charging module J and the 48V-to-12V buck charging module K through serial ports, sends instructions and receives various state information of the 12V-to-48V boosting charging module J and the 48V-to-12V buck charging module K; the CAN level conversion module M CAN also receive and upload CAN messages so as to communicate with a 48V energy storage system of a motor home, receive instructions and upload state information.

The structure of the bidirectional DCDC module B is shown in fig. 2, and includes a 12V to 48V boost charging module, a 48V to 12V buck charging module, an MCU module, and a CAN level conversion module; the 12V-to-48V boosting charging module and the 48V-to-12V reducing charging module are respectively connected with the MCU module, and the MCU module is connected with the CAN level conversion module.

During working, signals uploaded to the CAN bus by the internal MCU module L through the CAN level conversion module M of the bidirectional DCDC module B comprise the working state (a boosting state, a voltage reduction state, a standby state and a fault state) of the bidirectional DCDC module B, the working voltage and current of the 12V side, the working voltage and current of the 48V side and whether protection (overvoltage protection, undervoltage protection, overcurrent protection and short-circuit protection) occurs.

In addition, the 12V-48V boost charging module J and the 48V-12V buck charging module K transmit the working states (12V side voltage and current, 48V side voltage and current, whether protection occurs) of the modules to the internal MCU module L through serial port communication respectively, and then the MCU module L uploads the working states to the CAN bus through the CAN level conversion module M.

When the bidirectional DCDC module B is in a boosting charging state, the maximum charging current can be dynamically adjusted according to the output voltage of the generator, when the voltage is smaller than 12.6V, charging is stopped, the bidirectional DCDC module B is switched into a standby state, when the voltage is smaller than 13V and larger than 12.6V, the existing charging current is kept, when the voltage is larger than 13V, the charging current is adjusted to be the maximum charging current, and the current adjustment is increased or decreased by 1A per second according to the output voltage of the generator. The dynamic adjustment charging current is set to fully utilize the power of the generator, and simultaneously, the energy of a 12V starting storage battery is used for boosting charging under the condition that the 12V load of the original vehicle is large, so that the problem that the vehicle cannot be restarted after being stopped is avoided.

In winter, the temperature is lower than zero, the lithium battery E is heated to 10 ℃ before charging, the lithium battery E CAN send a heating instruction to the CAN bus, and after the control module A identifies the heating instruction, the charging and inverting integrated machine C or the bidirectional DCDC module B CAN be started to heat the lithium battery E according to the states of the city and the generator.

As shown in fig. 3, the 48V to 12V buck charging module includes a first surge suppression circuit, an electromagnetic filter circuit, a buck H-bridge, a first transformer T1, a buck rectifying/filtering circuit, and a second surge suppression circuit; the input end of the first surge suppression circuit is connected with 48V voltage, the output end of the first surge suppression circuit is connected with the electromagnetic filter circuit, the output end of the electromagnetic filter circuit is connected with the input end of the voltage reduction H bridge, the output end of the voltage reduction H bridge is connected with the first transformer T1, the output end of the first transformer T1 is connected with the voltage reduction rectifying/filtering circuit, the output end of the voltage reduction rectifying/filtering circuit is connected with the second surge suppression circuit, and the output end of the second surge suppression circuit outputs 12V voltage.

48V changes 12V step-down module of charging still includes first drive circuit T2, step-down voltage sampling circuit, step-down current sampling circuit, step-down detection circuit, step-down MCU, step-down side optical coupling is kept apart, step-down DSP, electromagnetic filter return circuit's output still is connected with step-down detection circuit's input, step-down detection circuit's output termination step-down MCU, step-down MCU's output termination step-down side optical coupling is kept apart, the output termination step-down DSP that step-down side optical coupling was kept apart, step-down DSP passes through first level optical coupling and keeps apart and is connected with main MCU, step-down voltage sampling circuit, step-down current sampling circuit's input is connected with step-down rectification/filter circuit's output respectively, step-down voltage sampling circuit, step-down. The buck DSP is further connected to an input of the first driver circuit T2, and an output of the first driver circuit T2 is connected to the buck H-bridge.

The 48V-to-12V step-down charging module further comprises a step-down auxiliary power supply and a third transformer T3, the electromagnetic filter loop is further connected with the input end of the step-down auxiliary power supply, the output end of the step-down auxiliary power supply is connected with the third transformer T3, and the third transformer T3 outputs the auxiliary power supply.

The 12V-to-48V boost charging module comprises a boost second rectifying/filtering circuit, a third surge suppression circuit, a boost first rectifying/filtering circuit, a fifth transformer T5, a boost H bridge and a fourth surge suppression circuit; the input end of the fourth surge suppression circuit is connected with 12V voltage, the output end of the fourth surge suppression circuit is connected with a boosting H bridge, the output end of the boosting H bridge is connected with a fifth transformer T5, the output end of a fifth transformer T5 is connected with a boosting first rectifying/filtering circuit, the output end of the boosting first rectifying/filtering circuit is connected with a third surge suppression circuit, the output end of the third surge suppression circuit is connected with a boosting second rectifying/filtering circuit, and the output end of the boosting second rectifying/filtering circuit outputs 48V voltage.

The 12V-to-48V boosting charging module further comprises a boosting detection circuit, a boosting MCU, a boosting side optical coupling isolation, a boosting DSP, a boosting voltage sampling circuit, a boosting current sampling circuit and a second driving circuit T4; the output of fourth surge suppression circuit still with the detection circuitry connection that steps up, MCU that steps up is connected to detection circuitry's the output that steps up, MCU's the output connection that steps up sidelight optical coupling keeps apart, DSP that steps up is connected to the output that the sidelight optical coupling keeps apart that steps up, the voltage sampling circuit that steps up, the input of the current sampling circuit that steps up all is connected with the output of the first rectifier/filter circuit that steps up, the voltage sampling circuit that steps up, the output termination of the current sampling circuit that steps up DSP step up DSP, the output termination of DSP that steps up second drive circuit T4, the output termination of second drive circuit T4 steps up the H bridge, the DSP that steps up still keeps apart through the second level optical coupling and is.

The utility model discloses 12V changes 48V and steps up charging module still includes auxiliary power supply, sixth transformer T6 that steps up, and the output termination that steps up second rectifier/filter circuit steps up auxiliary power supply's input, the output termination that steps up auxiliary power supply sixth transformer T6's input, sixth transformer T6's output auxiliary power supply. When the system fails to work normally due to sudden power failure, the boosting auxiliary power supply works and outputs electric energy to the system through the sixth transformer T6 to provide a standby power supply for the system, so that the emergency capacity of the system is improved.

The utility model discloses a work flow includes following step:

1) and the control module enters initialization after being powered on.

2) After the initialization is normal, whether the bidirectional DCDC module B, the lithium battery E and the home control module F are in loss of connection or not is respectively detected, and if equipment is in loss of connection, an loss of connection processing program is entered.

3) After the two steps are normal, the 48V power supply system enters a pre-charging state, and maintenance needs to be prompted when the pre-charging fails.

4) And after the pre-charging is finished, respectively detecting whether the charging and inverting integrated machine C and the photovoltaic MPPT charging controller D are disconnected. And if the equipment is lost, entering a lost connection processing program.

5) After the normal start, the control module determines the working state of each device according to the actual state.

As shown in fig. 4, the specific steps are as follows:

step T01, the system is initialized to normal;

step T02, the equipment is disconnected;

in a step T03, the method comprises the following steps,

step T031, the lithium battery requests to charge, the generator works, charge the inversion all-in-one not in the charging state, the two-way DCDC module enters the boost charging state;

t032, the lithium battery requests heating, the generator works, and the charging and inverting integrated machine is not in a heating state, and the bidirectional DCDC module enters a boosting and heating state;

t033, enabling the lithium battery to be in a discharging state, stopping the generator and enabling the bidirectional DCDC module to enter a voltage reduction state;

t034, accessing the mains supply, working the generator and enabling the bidirectional DCDC module to enter a standby state;

step T035, the mains supply is connected, the generator does not work, and the bidirectional DCDC module enters a voltage reduction state;

in a step T04, the method comprises the following steps,

step T041, switching an inversion function according to the instruction sent by the home control module;

step T042, the bidirectional DCDC module and the photovoltaic MPPT charging controller in the system can also perform a charging function, but the charging function of the charging and inverting integrated machine has the highest priority, namely, the mains supply has the priority (charging and heating functions).

Step T05, the photovoltaic MPPT charging controller enters a charging state only when the mains supply is not connected, the lithium battery requests charging, and the bidirectional DCDC module is not in a boosting charging state;

in a step T06, the method comprises the following steps,

t061, the household control module can switch on and off the inversion function of the charging and inversion integrated machine to provide electric energy for 220Vac alternating-current electric appliances;

step T062, house control module, according to the signal that the control module transmits, will reveal every on-line working condition and alarm information of the consumer;

step T063, the home control module records the service condition of each device in the background so as to facilitate maintenance;

in a step T07, the method comprises the following steps,

step T071, charging and discharging according to the electric quantity condition;

step T072, when the temperature is lower than zero, a heating request instruction needs to be sent before charging, and charging can be carried out only when the temperature is heated to 10 ℃;

step T08, the precharging fails, the system is in failure and needs to be maintained;

step T09, the bidirectional DCDC module B is disconnected;

step T10, the household control module F is disconnected;

step T11, disconnecting the lithium battery E;

step T12, disconnecting the charging and inverting integrated machine C;

step T13, the photovoltaic MPPT charging controller is disconnected;

step T14, precharge is completed;

and step T15, the system self-starting is completed.

The utility model discloses convert traditional 12V energy storage battery system into 48V voltage and give the car as a house power supply, can greatly reduced line current, effectively avoid the spontaneous combustion phenomenon because of the heavy current generates heat and causes, avoid the problem that various super large currents brought simultaneously.

Although embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A48V power supply system applied to a caravan with photovoltaic power generation is characterized by comprising a generator, a 12V starting battery, a bidirectional DCDC module, a lithium battery, a control module, a charging and inverting integrated machine, a photovoltaic charging controller, an intelligent household module and a photovoltaic cell panel;

the output end of the 12V starting battery is further connected with the power supply end of the control module, the output end of the control module is connected with the power supply end of the lithium battery and the power supply end of the household control module respectively, and the starting signal output end of the generator is further connected with the input end of the control module.

2. The 48V power supply system applied to the recreational vehicle with photovoltaic power generation of claim 1, wherein the bidirectional DCDC module comprises a 12V to 48V boost charging module, a 48V to 12V buck charging module, an MCU module and a CAN level conversion module; the 12V-to-48V boosting charging module and the 48V-to-12V reducing charging module are respectively connected with the MCU module, and the MCU module is connected with the CAN level conversion module.

3. The 48V power supply system applied to the photovoltaic power generation caravan as claimed in claim 1, wherein the 48V to 12V buck charging module comprises a first surge suppression circuit, an electromagnetic filter circuit, a buck H bridge, a first transformer, a buck rectifying/filtering circuit and a second surge suppression circuit; the input end of the first surge suppression circuit is connected with 48V voltage, the output end of the first surge suppression circuit is connected with an electromagnetic filter circuit, the output end of the electromagnetic filter circuit is connected with the input end of a voltage reduction H bridge, the output end of the voltage reduction H bridge is connected with a first transformer, the output end of the first transformer is connected with a voltage reduction rectifying/filtering circuit, the output end of the voltage reduction rectifying/filtering circuit is connected with a second surge suppression circuit, and the output end of the second surge suppression circuit outputs 12V voltage.

4. The 48V power supply system applied to the caravan with photovoltaic power generation of claim 3, wherein the 48V to 12V step-down charging module further comprises a first driving circuit, a step-down voltage sampling circuit, a step-down current sampling circuit, a step-down detection circuit, a step-down MCU, a step-down side optical coupling isolation and a step-down DSP, the output end of the electromagnetic filter circuit is further connected with the input end of the step-down detection circuit, the output end of the step-down detection circuit is connected with the step-down MCU, the output end of the step-down MCU is connected with the step-down side optical coupling isolation, the output end of the step-down side optical coupling isolation is connected with the step-down DSP, the step-down DSP is connected with the main MCU through a first stage optical coupling isolation, the input ends of the step-down voltage sampling circuit and the step-down current sampling circuit are respectively connected with the output end of the step-down rectifying/filtering circuit, the voltage reduction DSP is also connected with the input end of the first driving circuit, and the output end of the first driving circuit is connected with the voltage reduction H bridge.

5. The 48V power supply system applied to the photovoltaic house car as claimed in claim 3, wherein the 48V to 12V step-down charging module further comprises a step-down auxiliary power supply and a third transformer, the electromagnetic filter circuit is further connected with an input end of the step-down auxiliary power supply, an output end of the step-down auxiliary power supply is connected with the third transformer, and the third transformer outputs the auxiliary power supply.

6. The 48V power supply system applied to the photovoltaic power generation caravan as claimed in claim 1, wherein the 12V to 48V boost charging module comprises a boost second rectifying/filtering circuit, a third surge suppression circuit, a boost first rectifying/filtering circuit, a fifth transformer, a boost H bridge and a fourth surge suppression circuit; the input end of the fourth surge suppression circuit is connected with 12V voltage, the output end of the fourth surge suppression circuit is connected with a boost H bridge, the output end of the boost H bridge is connected with a fifth transformer, the output end of the fifth transformer is connected with a boost first rectifying/filtering circuit, the output end of the boost first rectifying/filtering circuit is connected with a third surge suppression circuit, the output end of the third surge suppression circuit is connected with a boost second rectifying/filtering circuit, and the output end of the boost second rectifying/filtering circuit outputs 48V voltage.

7. The 48V power supply system applied to the recreational vehicle with photovoltaic power generation of claim 6, wherein the 12V-to-48V boosting charging module further comprises a boosting detection circuit, a boosting MCU, a boosting side optical coupling isolation, a boosting DSP, a boosting voltage sampling circuit, a boosting current sampling circuit and a second driving circuit; the output end of the fourth surge suppression circuit is connected with the boost detection circuit, the output end of the boost detection circuit is connected with the boost MCU, the output end of the boost MCU is connected with the boost side optical coupling isolation, the output end of the boost side optical coupling isolation is connected with the boost DSP, the input ends of the boost voltage sampling circuit and the boost current sampling circuit are connected with the output end of the boost first rectifying/filtering circuit, the output ends of the boost voltage sampling circuit and the boost current sampling circuit are connected with the boost DSP, the output end of the boost DSP is connected with the second drive circuit, the output end of the second drive circuit is connected with the boost H bridge, and the boost DSP is further connected with the main MCU through the second stage optical coupling isolation.

8. The 48V power supply system applied to the photovoltaic power generation caravan as claimed in claim 6, wherein the 12V-to-48V boost charging module further comprises a boost auxiliary power supply and a sixth transformer, the output end of the boost second rectifying/filtering circuit is connected with the input end of the boost auxiliary power supply, the output end of the boost auxiliary power supply is connected with the input end of the sixth transformer, and the output end of the sixth transformer outputs the auxiliary power supply.

9. The 48V power supply system applied to the caravan with the photovoltaic power generation function according to claim 1, wherein the intelligent home module is at least connected with an inversion function switch of the inversion all-in-one machine, an entertainment system switch, a lighting system switch, a water tank switch, an air conditioner switch and a heater switch.

10. The 48V power supply system applied to the recreational vehicle with photovoltaic power generation of claim 1, wherein CAN communication interfaces of the control module, the bidirectional DCDC module, the charging and inverting all-in-one machine, the photovoltaic charging controller, the lithium battery and the smart home module are respectively connected to a CAN bus of the power supply system.